changing boundaries

sankar

I want to simulate a model with let say five inlets and one outlet,but all inlets should not work at a same time that means inlets are time dependent. Suppose i want to trigger first 2 inlets rest inlets should be treated as wall and then as one time step is over next inlets should be triggered. STAR-Cd user guide says we can do that by advanced transients option and GT-power but how to use that and how to redefine the boundary type e.g changing from wall to inlet and vice versa i dont know. If anybody help me out of this i wld be grateful.